CHEMISTRY HIGH SCHOOL

What is the mass of 0.7891 mol of (fe2o3)?

Answers

Answer 1
Answer: Molar mass F₂O₃ = 159.69 g/mol

1 mole ------------------ 159.69 g
0.7891 moles ---------- ? g

mass = 0.7891 x 159.69 / 1

= 126.01 g 

hope this helps!

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A solution has the 23.22% mass/volume of a particular solvent what is the mass of solute dissolved in 2.5 liter of solvent?

Answers

23.22%:

2.5 L in mL : 2.5 * 1000 = 2500 mL

23.22 g ----------- 100 mL
   ? g -------------  2500 mL

m = 2500 * 23.22 / 100

m = 58050 / 100

m = 580,5 g

Rusting is the common name for the corrosion of iron or steel. the brown-orange rust commonly seen on iron or steel cars, nails, chains, or posts has the formula fe2o3. what is its iupac name?

Answers

The IUPAC name for Fe2O3 is Iron (III) oxide. Rusting is the common name for the corrosion of iron or steel.

Rusting of iron is known as as corrosion and withinside the procedure of corrosion the iron get transformed into iron oxide and that is an instance of chemical change. The chemical formula of rust is Fe2O3. The interplay of Iron with air and water produces rust. The Oxygen exist withinside the air shape a powdered substance known as rust. The rust is a red-orange flaky substance and the phenomenon of the formation of rust is known as rusting. Rusting is an oxidation procedure, and is much more likely to arise at the steel surface.

Therefore, the IUPAC name for Fe2O3 is Iron (III) oxide.

To learn more about rusting check the link below:

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How many moles of CaO are needed to react with an excess of water to form 370 grams of calcium hydroxide?

Answers

The required moles of CaO are needed to react with an excess of water to form 370 grams of calcium hydroxide is 280g.

What is the relation between mass & moles?

Relation between the mass and moles of any substance will be represented as:

n = W/M, where

  • W = given mass
  • M = molar mass

Given chemical reaction is:

CaO + H₂O → Ca(OH)₂

Moles of Ca(OH)₂ = 370g / 74g/mol = 5mol

From the stoichiometry of the reaction, 5 moles of CaO is required to produce 5 moles of Ca(OH)₂.

Mass of CaO = (5mol)(56g/mol) = 280g.

Hence required mass of CaO is 280g.

To know more about mass & moles, visit the below link:
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CaO + H20 --> Ca(OH)2 

Calcium Hydroxide has a relative molecular mass of approximately 74 grams. Therefore, with 370 grams provided, we have 370g/74g, or 5 moles. 

Therefore, due to molar ratios, 5 moles of CaO must have reacted with 5 moles of H2O to form 5 moles of Ca(OH)2. 

The answer to your question is 5 moles of CaO or 280 g of CaO 

__________ What is the value of the activation energy for the forward reaction? Be sure to include theappropriate sign.

Answers

Answer:

+60 kJ

Explanation:

Activation energy = PE(AB) - PE(A+B) = 100 -40 = +60 kJ

Why is nonpoint source pollution potentially more harmful than point source pollution?a.Nonpoint source pollution disrupts the water cycle.
b.Nonpoint source pollution is difficult to regulate.
c.Nonpoint source pollution comes from more than one source.
d.Nonpoint source pollution is more damaging to living organisms than point source pollution

Answers

A, nonpoint souce pollution is "a main problem with water quality."

Edgeuity says the correct answer is B

Sexual reproduction A. helped maintain a slow rate of evolutionary change.
B. limited the material in which natural selection can act upon.
C. increased genetic variation.
D. maintained the same gene combinations over time.

Answers

The answer is C sexual reproduction increases genetic variation
Sexual reproduction increased genetic variation.

C. increased genetic variation.

~Evie
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